<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="./js/jquery.js"></script>
    <script src="./js/three.js"></script>
    <script src="./js/snow.js"></script>
    <title>Document</title>
</head>
<style>
    body {
        background-image: url('img/back.jpg');
        background-size: cover;
        background-repeat: no-repeat;
        position: relative;
        width: 100%;
        height: 100vh;
    }
    .snow{
                background-image: url('img/back.jpg');
        background-size: cover;
        background-repeat: no-repeat;
        position: relative;
        width: 100%;
        height: 100vh;
    }
</style>

<body>
    <!-- snow.js为配置文件。背景更换在第二行。47-51行换图片 -->
</body>

</html>